it.unimi.dsi.fastutil.objects

Class Object2ObjectFunctions.EmptyFunction<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction<K,V>

it.unimi.dsi.fastutil.objects.Object2ObjectFunctions.EmptyFunction<K,V>

All Implemented Interfaces:

Object2ObjectFunction<K,V>, Serializable, Cloneable, Function<K,V>

Direct Known Subclasses:

Object2ObjectMaps.EmptyMap

Enclosing class:

Object2ObjectFunctions

public static class Object2ObjectFunctions.EmptyFunction<K,V>
extends AbstractObject2ObjectFunction<K,V>
implements Serializable, Cloneable

An immutable class representing an empty type-specific function.

This class may be useful to implement your own in case you subclass a type-specific function.

See Also:

Serialized Form

Field Summary

Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction

defRetValue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EmptyFunction()

Method Summary

Modifier and Type	Method and Description
void	clear()
Object	clone()
boolean	containsKey(Object k)
V	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(V defRetValue) Sets the default return value (optional operation).
boolean	equals(Object o)
V	get(Object k) Returns the value to which the given key is mapped.
int	hashCode()
int	size()
String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectFunction

put, remove

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

EmptyFunction

protected EmptyFunction()

Method Detail

get

public V get(Object k)

Description copied from interface: Object2ObjectFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Object2ObjectFunction<K,V>

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

See Also:

Function.get(Object)

containsKey

public boolean containsKey(Object k)

defaultReturnValue

public V defaultReturnValue()

Description copied from interface: Object2ObjectFunction

Gets the default return value.

This default implementation just return the default null value of the type (null for objects, 0 for scalars, false for Booleans).

Specified by:

defaultReturnValue in interface Object2ObjectFunction<K,V>

Overrides:

defaultReturnValue in class AbstractObject2ObjectFunction<K,V>

Returns:

the current default return value.

defaultReturnValue

public void defaultReturnValue(V defRetValue)

Description copied from interface: Object2ObjectFunction

Sets the default return value (optional operation). This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.

Specified by:

defaultReturnValue in interface Object2ObjectFunction<K,V>

Overrides:

defaultReturnValue in class AbstractObject2ObjectFunction<K,V>

Parameters:

defRetValue - the new default return value.

See Also:

Object2ObjectFunction.defaultReturnValue()

size

public int size()

clear

public void clear()

clone

public Object clone()

Overrides:

clone in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object